exam Maths Puzzle Numerical Ability

could anyone help me with these two questions?

1. Is the graph of a circle a graph of a function? (Yes or no)

2. Find the center and the radius of the circle represented by the equation
x2 + y2 + 10x � 4y � 7 = 0

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exam Other Question

Leon drove 270 miles the lodge in the same time as Pat drove 330 miles to the lodge. If Pat drove 10 miles per hour faster than Leon, then how fast did each of them drive? the sum of two consecutive integers is two less than three times the smaller number. Find the integers.